{"id":"375e13f1-df0a-4255-a600-1f4de6c914c3","shortId":"JGChqy","kind":"x402","title":"Pay-per-call API platform on Base via x402 — $0.02/request, no API keys required.","tagline":"Pay-per-call API platform on Base via x402 — $0.02/request, no API keys required.","description":"lowpaymentfee.com is an x402-enabled API platform that offers a broad catalog of endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and utility services. Every endpoint is priced at $0.02 per request, paid in USDC on the Base network via the x402 payment protocol. There are no API keys, no rate limits, and no sign-up — callers simply attach an X-PAYMENT header with a valid x402 payment proof.\n\nThe specific endpoint at `/api/v1/payments/360` is listed as \"Premium API Access.\" The x402 challenge confirms it is live, accepting POST requests and requiring up to 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. The payment is settled to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout.\n\nThe broader platform advertises endpoints for sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, token quotes, gas estimates, geocoding, validation, conversion, and data generation — all at the same $0.02 price point. However, documentation beyond the landing page is essentially empty (all sub-pages just show \"Connect wallet\"), so the actual request/response schemas for this and other endpoints are unknown. Without docs or an OpenAPI spec, callers will need to experiment to discover accepted input formats and response structures.","tags":[],"capabilities":["x402-payment","pay-per-request","usdc-base","no-api-key","no-rate-limits","data-analytics","ai-inference","finance-data","crypto-data","utility-services"],"categories":["api-platform","finance","llm","geo"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","premium API access","crypto-paid API"],"warnings":["No API documentation available — all doc/pricing/README pages return only 'Connect wallet' with no content.","No OpenAPI or output schema provided; request and response formats are unknown.","The specific purpose of /api/v1/payments/360 ('Premium API Access') is unclear — it may be a generic or placeholder endpoint.","Cannot verify what data or service this endpoint actually returns without making a paid request."],"endpointUrl":"https://lowpaymentfee.com/api/v1/payments/360","protocol":"x402","transport":"http","auth":{"type":"x402","details":[{"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","extra":{"name":"USD Coin","version":"2"},"payTo":"0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3","scheme":"exact","network":"base","mimeType":"application/json","resource":"https://lowpaymentfee.com/api/v1/payments/360","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base). However, there is no OpenAPI spec, no documentation (all doc pages are blank), no request/response schema, and the purpose of this specific '/payments/360' endpoint is entirely opaque beyond the label 'Premium API Access.' The listing is effectively a 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'/request':12,28 '0.02':11,27,63,142,190 '000':131 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':154 '0x8335':136 '20':130 '2913':137 '300':157 '6':146 'Base network API' 'USDC micropayment API' 'accept':123,235 'access':115 'actual':212 'address':153 'advertis':163 'ai-inference' 'ai/ml':51 'analysi':167 'analyt':50 'api':5,14,21,30,39,81,114 'attach':93 'base':8,24,71,132,139 'beyond':195 'broad':44 'broader':161 'call':4,20 'caller':91,228 'catalog':45 'challeng':118 'classif':170 'confirm':119 'connect':208 'convers':182 'crypto-data' 'crypto-paid API' 'data':49,54,184 'data-analytics' 'decim':147 'discov':234 'doc':223 'document':194 'embed':171 'empti':201 'enabl':38 'endpoint':47,59,107,164,219 'equal':141 'essenti':200 'estim':179 'everi':58 'exchang':174 'experi':232 'feed':173 'finance-data' 'finance/web3':53 'format':237 'gas':178 'generat':185 'geocod':180 'given':143 'header':98 'howev':193 'infer':52 'input':236 'key':15,31,82 'land':197 'limit':85 'list':111 'live':122 'lowpaymentfee' 'lowpaymentfee.com':33 'need':230 'network':72 'no-api-key' 'no-rate-limits' 'offer':42 'openapi':226 'page':198,205 'paid':66 'pay':2,18 'pay-per-cal':1,17 'pay-per-call API' 'pay-per-request' 'payment':76,97,103,149 'per':3,19,64 'platform':6,22,40,162 'point':192 'post':124 'premium':113 'premium API access' 'price':61,172,191 'proof':104 'protocol':77 'quot':177 'rate':84,175 'request':65,125 'request/response':213 'requir':16,32,127 'respons':239 'schema':214 'second':158 'sentiment':166 'servic':57 'settl':151 'show':207 'sign':89 'sign-up':88 'simpli':92 'span':48 'spec':227 'specif':106 'structur':240 'sub':204 'sub-pag':203 'summar':169 'text':168 'timeout':159 'token':176 'unit':133 'unknown':221 'usdc':68,135,144 'usdc-base' 'util':56 'utility-services' 'valid':101,181 'via':9,25,73 'wallet':209 'without':222 'x':96 'x-payment':95 'x402':10,26,37,75,102,117 'x402 API' 'x402-enabled':36 'x402-payment'","prices":[{"id":"14680eef-d733-4eae-9acc-dcd4234aaf01","listingId":"375e13f1-df0a-4255-a600-1f4de6c914c3","amountUsd":null,"unit":"per_call","nativeCurrency":"USD COIN","nativeAmount":"20000","chain":"base","payTo":"0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3","paymentMethod":"x402-usd coin","isPrimary":true,"details":{"scheme":"exact","mime_type":"application/json","accepts_all":[{"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","extra":{"name":"USD Coin","version":"2"},"payTo":"0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3","scheme":"exact","network":"base","mimeType":"application/json","resource":"https://lowpaymentfee.com/api/v1/payments/360","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:50:23.518Z"}],"sources":[{"listingId":"375e13f1-df0a-4255-a600-1f4de6c914c3","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/payments/360","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:50:23.518Z","lastSeenAt":"2026-04-23T04:01:32.408Z"}],"details":{"listingId":"375e13f1-df0a-4255-a600-1f4de6c914c3","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/payments/360 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-proof>\" \\\n  -d '{}'","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"Endpoint returns 402 with x402 challenge requiring up to 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/payments/360"},{"claim":"Platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/payments/360"},{"claim":"Platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing AI inference (sentiment, summarization, classification, embeddings) without API key management","Fetching real-time crypto token quotes and gas estimates via micropayment","Running geocoding or data validation calls with per-request USDC payment","Exporting analytics data or generating reports on demand"],"bestFor":["Developers who want instant API access without sign-up or subscription","Agents and bots that can settle x402 payments autonomously on Base","Low-volume or sporadic API consumers who prefer pay-per-use over monthly plans"],"notFor":["High-volume production workloads where $0.02/request adds up significantly","Users who need detailed API documentation and guaranteed SLAs before integrating","Developers without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:07.274Z"},"updatedAt":"2026-04-23T04:01:32.408Z"}}